P0698

P0698-SENSOR REFERENCE VOLTAGE 3 CIRCUIT LOW

For a complete wiring diagram refer to the Wiring Information Electrical Diagrams.

Theory of Operation

This sensor supply circuit provides a 5-volt supply to the Accelerator Pedal Position (APPS) 1 Sensor. The ECM illuminates the MIL lamp immediately after the diagnostic runs and fails. The ETC lamp will also flash. During this time the customer will be in a limp home mode. The ECM will turn off the MIL lamp after the diagnostic runs and passes in 4 consecutive drive cycles.

- When Monitored:
With engine running.

- Set Condition:
Low voltage detected at the (K852) 5-volt supply circuit.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure

1. ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, record all Freeze frame data.
3. With the scan tool, erase DTCs.
4. Turn the ignition off for 30 seconds.
5. Turn the ignition on.
6. With the scan tool, read DTCs.

Did the DTC reset?

Yes

- Go To 2

No

- Refer to the INTERMITTENT CONDITION - DIESEL (Diagnostic Procedure). Intermittent Condition Test

2. APPS SENSOR 1




1. Ignition on.
2. Disconnect the Accelerator Pedal Position Sensor harness connector.

NOTE: Check connectors - Clean/repair as necessary.

3. Measure the voltage on the (K852) 5-volt supply circuit at the Accelerator Pedal Position Sensor harness connector.

Is the voltage reading between 4.9 and 5.1 volts?

Yes

- Replace the Accelerator Pedal Position Sensor.
- Perform POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test

No

- Go To 3

3. (K852) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND




1. Turn the ignition off.
2. Disconnect the ECM C2 harness connector.
3. Check connectors - Clean/repair as necessary.
4. Measure the resistance between ground and the (K852) 5-volt supply circuit at the Accelerator Pedal Position Sensor harness connector.

Is the resistance below 10k ohms?

Yes

- Repair the short to ground in the (K852) 5-volt supply circuit.
- Perform POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test

No

- Go To 4

4. (K852) 5-VOLT SUPPLY CIRCUIT SHORTED TO ANOTHER CIRCUIT
1. Measure the resistance between the (K852) 5-volt supply circuit and all other circuits at the ECM C2 harness connector.

Is the resistance below 10k ohms between the (K852) 5-volt supply circuit and any of the circuits?

Yes

- Repair the short to the circuit that measured less than 10k ohms.
- Perform POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test

No

- Replace and program the ECM.
- Perform POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test